Guice

问题 I have method: public void changeItemName(long id, String nmae) { Item item = itemDAO.find(id); item.setName(name); try { itemDAO.save(item); } catch (RollbackException | OptimisticLockException | StaleStateException e) { logger.warn("Retry method after " + e.getClass().getName()); itemDAO.clear(); changeItemName(id, name); } } First, I manually provoke OptimisticLockException by setting higher version, so it goes to catch block, clears EntityManager and retries the method. When retrying, the

问题 I have a use case of injecting a class inside an implementation of ConstraintValidator. I'm using Google guice for Dependency injection and am currently unable to inject inside the validator. Simplified form of my scenario Inside Module: @Provides @Singleton public ServiceA getServiceA() { return new ServiceA(); } The constraint validator: public class MyValidator implements ConstraintValidator<ValidS,List<String>> { private final ServiceA serviceA; @Inject public MyValidator(ServiceA

问题 I have an object in Guice with scope singleton. In method f() I want to create a new object but let Guice do the injection. I think it is not a good practice to pass the injector around. So how can I get a new "Guicy" instance of object? 回答1: As suggested above, probably provider is the way to do it. it is also mentioned in this question. 来源： https://stackoverflow.com/questions/9819794/how-to-create-an-object-from-a-different-scope

问题 I want to use Spring Data JPA in my web application build with Google Guice. And I found out that Google Guice provide the Guice Persist and say "JPA (Java Persistence API) - with any compliant vendor implementation.". Google Guice Persist - https://github.com/google/guice/wiki/GuicePersist Is it possible to use Spring Data JPA into Google Guice ? 回答1: I believe guice repository does what you want. It makes Spring Data JPA easy to use with Google Guice. 来源： https://stackoverflow.com/questions

问题 Given an injector, I am wondering how I can retrieve a specific instance of some parameterized type (but I don't have the Type itself). Let me explain myself: Imagine that you have made the following bindings: List<Apple> bound to ArrayList<Apple> Set<Pears> bound to HashSet<Pear> etc... for other Collection of Fruit . Now I have a Fruit fruit instance and I would like to retrieve the appropriate Collection instance. How can I achieve this? Here is a small working snippet that illustrates

问题 I'm using Guice in Jersey2 for DI (i want to use it so i can use Google App Engine -> not working with HK2). My ApplicationResource: public class ApplicationResource extends ResourceConfig { private static final Logger LOGGER = null; public ApplicationResource() { System.out.println("Application startup"); // Register resources and providers using package-scanning. packages("com.crawler.c_api"); // Register my custom provider - not needed if it's in my.package. register(ResponseCorsFilter

问题 Is there an easy way to enumerate all the singleton instances already created by a Guice Injector? Or alternately a way to get all singletons that implement a specific interface? I would like to find all singleton instances that implement java.io.Closeable so I can close them cleanly when my service is shut down. 回答1: This would be fairly easy to write using Guice's SPI. Guice's Injector instance exposes a getAllBindings() method that lets you iterate through all of the bindings. // Untested

问题 I'd like to get Jersey2 and Guice to cooperate together, which is apparently rather difficult. I've seen some solution to this involving using the HK2-to-Guice bridge. But the bridge rely on getting the HK2 ServiceLocator instance in the init() of a custom Jersey2 ServletContainer in order to initialize GuiceBrige : public class MyServletContainer extends ServletContainer { @Override public void init() { ServiceLocator sloc = getApplicationHandler().getServiceLocator(); ... } } But somehow in

问题 I'm using Cucumber with Guice as DI. I've encountered following problem: I've got one step i.e. class MyStep() { @Inject private MyService myService; @Given("Some acction happen") public void sthHappen() { myService.doSth(); } } And I've got this class to run it as JUnit test @RunWith(Cucumber.class) @CucumberOptions(...) public class MyTest { } There is a class MyModule extends AbstractModule { @Override protected void configure() { bind(MyService.class).to(MyFirstService.class); } } which

问题 Ok, I know my computations are not objective and so on, but anyway, I hate to wait so much time when performing my unit-tests: My guice swing application takes about 7 seconds to initialize. It's a simple IRC client. At that moment, no connection are open, I even haven't called any java.io or java.net classes yet. I've tried to narrow down what exactly is wrong and I get that 5.8 seconds (average) are used by Guice in order to create the injector with the 2 modules I'm using (one normal